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Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia

This study was carried out on a randomly chosen 10-ha (200 × 500 m) forest area within the 50-ha area Demography Project of the Forest Research Institute Malaysia (FRIM) at Pasoh Forest Reserve, Negri Sembilan, Malaysia. A modified minimum-variance method was used to determine statistically the most...

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Main Authors: Wan Mohd, Wan Razali, Wan Ahmad, Wan Mohd Shukri, Muktar, Ashari
Format: Article
Language:English
Published: Forest Research Institute Malaysia 1997
Online Access:http://psasir.upm.edu.my/id/eprint/51020/1/51020.pdf
http://psasir.upm.edu.my/id/eprint/51020/
https://www.frim.gov.my/en/publication/journal-of-tropical-forest-science-jtfs/
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spelling my.upm.eprints.510202017-05-02T04:35:52Z http://psasir.upm.edu.my/id/eprint/51020/ Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia Wan Mohd, Wan Razali Wan Ahmad, Wan Mohd Shukri Muktar, Ashari This study was carried out on a randomly chosen 10-ha (200 × 500 m) forest area within the 50-ha area Demography Project of the Forest Research Institute Malaysia (FRIM) at Pasoh Forest Reserve, Negri Sembilan, Malaysia. A modified minimum-variance method was used to determine statistically the most efficient quadrat size among the eight quadrat sizes used. The minimum sampling intensity associated with each quadrat size, at 90% confidence and 10% error, was determined in estimating tree volume. In general, the 30 × 30 m quadrat was found to be statistically the most efficient in sampling tree volume ≥ 15 cm dbh at 90% confidence and 10% error levels. The percentage sample size requirement differed between species groups, size classes and quadrat sizes used. The implications of the result of the present study are discussed in relation to the current inventory methods used in Malaysia. For example, a 16% sampling intensity is required to inventory all trees ≥ 15 cm dbh with 90% confidence and 10% error levels using 30 × 30 m quadrat, increasing to 24% when using 20 × 50 m quadrat. Forest Research Institute Malaysia 1997 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/51020/1/51020.pdf Wan Mohd, Wan Razali and Wan Ahmad, Wan Mohd Shukri and Muktar, Ashari (1997) Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia. Journal of Tropical Forest Science, 10 (2). pp. 141-154. ISSN 0128-1283 https://www.frim.gov.my/en/publication/journal-of-tropical-forest-science-jtfs/
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description This study was carried out on a randomly chosen 10-ha (200 × 500 m) forest area within the 50-ha area Demography Project of the Forest Research Institute Malaysia (FRIM) at Pasoh Forest Reserve, Negri Sembilan, Malaysia. A modified minimum-variance method was used to determine statistically the most efficient quadrat size among the eight quadrat sizes used. The minimum sampling intensity associated with each quadrat size, at 90% confidence and 10% error, was determined in estimating tree volume. In general, the 30 × 30 m quadrat was found to be statistically the most efficient in sampling tree volume ≥ 15 cm dbh at 90% confidence and 10% error levels. The percentage sample size requirement differed between species groups, size classes and quadrat sizes used. The implications of the result of the present study are discussed in relation to the current inventory methods used in Malaysia. For example, a 16% sampling intensity is required to inventory all trees ≥ 15 cm dbh with 90% confidence and 10% error levels using 30 × 30 m quadrat, increasing to 24% when using 20 × 50 m quadrat.
format Article
author Wan Mohd, Wan Razali
Wan Ahmad, Wan Mohd Shukri
Muktar, Ashari
spellingShingle Wan Mohd, Wan Razali
Wan Ahmad, Wan Mohd Shukri
Muktar, Ashari
Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia
author_facet Wan Mohd, Wan Razali
Wan Ahmad, Wan Mohd Shukri
Muktar, Ashari
author_sort Wan Mohd, Wan Razali
title Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia
title_short Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia
title_full Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia
title_fullStr Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia
title_full_unstemmed Natural forest dynamics. II. Sampling of tree volume using quadrats in tropical forests of Peninsular Malaysia
title_sort natural forest dynamics. ii. sampling of tree volume using quadrats in tropical forests of peninsular malaysia
publisher Forest Research Institute Malaysia
publishDate 1997
url http://psasir.upm.edu.my/id/eprint/51020/1/51020.pdf
http://psasir.upm.edu.my/id/eprint/51020/
https://www.frim.gov.my/en/publication/journal-of-tropical-forest-science-jtfs/
_version_ 1643834835027886080
score 13.211869

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